Table of contents

1. A Review of General Chemistry5h 5m
2. Molecular Representations1h 14m
3. Acids and Bases2h 46m
4. Alkanes and Cycloalkanes4h 17m
5. Chirality3h 39m
6. Thermodynamics and Kinetics1h 22m
7. Substitution Reactions1h 48m
8. Elimination Reactions2h 30m
9. Alkenes and Alkynes2h 9m
10. Addition Reactions3h 19m
11. Radical Reactions1h 58m
12. Alcohols, Ethers, Epoxides and Thiols2h 42m
13. Alcohols and Carbonyl Compounds2h 17m
14. Synthetic Techniques1h 26m
15. Analytical Techniques:IR, NMR, Mass Spect7h 3m
16. Conjugated Systems6h 13m
17. Ultraviolet Spectroscopy51m
18. Aromaticity2h 34m
19. Reactions of Aromatics: EAS and Beyond5h 1m
20. Phenols55m
21. Aldehydes and Ketones: Nucleophilic Addition4h 56m
22. Carboxylic Acid Derivatives: NAS2h 51m
23. The Chemistry of Thioesters, Phophate Ester and Phosphate Anhydrides1h 10m
24. Enolate Chemistry: Reactions at the Alpha-Carbon1h 53m
25. Condensation Chemistry2h 9m
26. Amines1h 43m
27. Heterocycles2h 0m
28. Carbohydrates5h 53m
29. Amino Acids4h 20m
30. Peptides and Proteins2h 42m
31. Catalysis in Organic Reactions1h 30m
32. Lipids 2h 50m
33. The Organic Chemistry of Metabolic Pathways2h 52m
34. Nucleic Acids1h 32m
35. Transition Metals6h 14m
36. Synthetic Polymers1h 49m

1. A Review of General Chemistry

Intro to Organic Chemistry

Organic Chemistry

1. A Review of General Chemistry

Intro to Organic Chemistry

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Multiple Choice

Which of the following is an example of a repressible operon in organic chemistry?

Lac operon

Gal operon

Ara operon

Trp operon

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Understand the concept of an operon: An operon is a cluster of genes under the control of a single promoter and is transcribed into a single mRNA strand. It is a key concept in gene regulation in prokaryotes.

Differentiate between inducible and repressible operons: Inducible operons are usually off and can be turned on by an inducer, while repressible operons are usually on and can be turned off by a repressor.

Identify the function of the Trp operon: The Trp operon is a classic example of a repressible operon. It is involved in the synthesis of tryptophan, an amino acid. When tryptophan levels are high, it acts as a corepressor and binds to the repressor protein, which then binds to the operator to inhibit transcription.

Compare with other operons: The Lac operon is an example of an inducible operon, which is activated in the presence of lactose. The Gal and Ara operons are also inducible, involved in the metabolism of galactose and arabinose, respectively.

Conclude that the Trp operon is the correct example of a repressible operon, as it is regulated by the presence of its end product, tryptophan, which represses its own synthesis when in abundance.